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Online since: October 2007
Authors: Yoshihiro Hosoya, Hiromi Yoshida, Kaneharu Okuda, Hidetaka Kawabe, Yasushi Tanaka, Toshiaki Urabe
However, high strength cold-rolled steel sheets based on interstitial-free (IF) chemistry with excellent deep drawability have been developed and reported at strength levels up to 440MPa even with compositions containing more than 2% manganese [4,5].
It is considered that the fine ferrite structure in the hot-band in Steel B is obtained by the austenite (γ) to ferrite (α) transformation from the deformed austenite caused by Nb addition during hot-rolling.
The ferrite structure of the hot-band of Steel B is smaller than that of Steel A, as shown Fig.1.
Both specimens show dual phase structures with ferrite and martensite.
In comparison with Steel A, the ferrite structure in Steel B exhibits recrystallized, more elongated, and coarser features under the lower volume fractions of the secondary phase.
Online since: December 2009
Authors: Mariam Al-Ma'adeed, M. Bader, N.J. Al-Thani
At low doses, the samples were more brittle and had more voids after aging, while at higher doses after aging, flakey texture on the fracture surface and short fibril structures were noticed.
Irradiation increased crosslinking, which encouraged the crystal growth on existed crystal structures and increased lamellae thicknesses, which in turn increased the crystallinity percentage of the polymer. 2 oxygen is always present in the UHMWPE when converted from powder (4), Storage in the absence of oxygen for a period of 8 months increased the oxidation even in the absence of oxygen environment, probably due to the presence of oxygen in the material itself during processing.
Aging and scission encouraged nucleation from scission parts and organization of structure, these crystallites did not grow with irradiation.
Change in Structure of Ultra High Molecular Weight Polyethylene Due to Irradiation in Air and in Nitrogen, International Journal of Polymer Analysis and Characterization 2006; 11, No.1. 3.
Silverman J.; Al-Sheikhly M.; Chappas W.J.; Zhan-Jun L.; Miller A.; Batsberg-Pedersen W., High-density polyethylene dosimetry by transvinylene FTIR analysis Radiation Physics and Chemistry 1999; 56 (6): 503-508. 14.
Online since: May 2011
Authors: Jun Long Zhou, Zhong Wen Ou, Qiao Chen, Yun Chen
The Influence of Admixtures on the Corrosion Protection Afforded Steel Reinforcement in Seawater-and-Seasand Concrete Junlong Zhou a, Zhongwen Ou b, Qiao Chen c, Yun Chen d Department of Chemistry and Materials Engineering, Logistical Engineering University, Chenjiaqiao Town Shapingba, Chongqing 401331, China ajunlongzhou@163.com, bouzhongwen@sina.com, cchenqiao_2008@yahoo.com.cn, dchenyuncy@126.com Keywords: seawater-and-sea sand concrete, the corrosion protection afforded steel reinforcement, admixtures, fly ash, slag, metakaolin Abstract.
However, for the mortar specimen with the addition of metakaolin, its structure becomes more compacted and no NaCl is found.
Its structure is presented below: Through the above-mentioned physical absorption Cl- has its binding capacity achieved in hydrated gel products.
CONCRETE,2003,2:17-19.In Chinese [2]Neville A.Chloride Attack of Reinforced Concrete: an Overview[J].Materials and Structures, 1995,28:63-70
Design for Corrosion Prevention Durability of Concrete Structures in Marine Environment.
Online since: November 2011
Authors: Wei Dong Zhu, Chun Hui Xu, Yun Chao Chen, Anna Peng, Ning Wei Wang, Hao Shang, Yi Jun Zhong
Maxwell-Stefan Equations Applied to the Modeling of Multi-Component Permeation through a Silicalite-1 Membrane Chunhui Xua, Yunchao Chenb, Anna Pengc, Ningwei Wangd, Hao Shange, Yijun Zhongf and Weidong Zhug Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, P.
The single component isotherms of linear and branched alkanes such as n-butane and isobutane can be described by the DSL (Dual-site Langmuir) model as follows [8,10]: (3) where and KC are the saturation capacity and the equilibrium constant on site C (the channels of silicalite-1 structure), respectively, and and KI are the analogous parameters on site I (the intersections).
Thus, it is logical that in an ordered structure for the binary adsorption at high loadings, corresponding to low temperatures, the linear n-butane molecules will reside in the channels, while the branched isobutane molecules will occupy the intersections.
The BDSL model precisely reflects this picture; at low temperatures about 6 n-butane molecules and 4 isobutane molecules per unit cell fill into the silicalite-1 structure.
Gardner, in: Structured Catalysts and Reactors, edited by A.
Online since: March 2004
Authors: G.H. Cao, Zhen Long Wang, Wan Sheng Zhao, Guan Xin Chi
The fabrication mechanism is studied primarily through a lot of experiments, and the energy spectrum and grain structure analysis were carried out on the fabricated microelectrode.
The smaller the micro parts are, the more strictly micro-machining is required, especially for drilling micro holes and machining micro 3D structures.
The cross-section of microelectrode is polished and treated with chemical etching in order to observe the micro-structure of microelectrode.
Fig.9 shows that there is a multi-layer structure at the boundary of fabricated microelectrode.
Many factors, such as electrode polarity, discharge duration, cooling capacity of dielectric medium and physical chemistry property of electrode material, influence the fabrication of microelectrode in a single discharge greatly.
Online since: July 2014
Authors: Somashekhar S. Hiremath, S. Santhosh Kumar
This paper reviews the stir processing method, mechanical properties, effect of particle size on properties of composites and structure of the metal matrix composites reinforced with nanoparticles.
The inadequacy of metals and alloys in providing both strength and stiffness to a structure has led to the development of various composites particularly metal matrix composites (MMCs) [1].
Gupta, Microstructural evolution and mechanical properties of Mg composites containing nano-B4C hybridized micro-Ti particulates, Materials Chemistry and Physics 143 (2014) 1178-1190.
Online since: June 2020
Authors: Tatiana Sadyrbaeva
Liquid Membrane System for Extraction and Electrodeposition of Copper(II) Tatiana Sadyrbaeva Institute of Inorganic Chemistry, Riga Technical University Paula Valdena 3/7, Riga, Latvia, LV-1048 tatiana.sadyrbaeva@rtu.lv Keywords: copper(II), liquid membrane, electrodialysis, electrodeposition, di(2-ethylhexyl)phosphoric acid.
Adherent copper coatings with a fine-grained structure were obtained from dilute sulfuric acid solutions.
The coatings have a sponge-like structure due to simultaneous copper deposition and hydrogen evolution on the cathode.
Online since: November 2020
Authors: Sergey M. Makarov, Mikhail A. Masharin, Eduard Yu. Danilovskiy, Anvar A. Zakhidov, Dmitry S. Gets, Grigorii A. Verkhogliadov
Mixed-halide perovskite allows to realize conception of light-emitting solar cell (LESC) due to possibility to in-situ change device band structure by formation of dipole layer under applied voltage and intrinsic properties of perovskite ions.
That mix-halide perovskite property allows to change band structure and provide reversable switching between SC and LED regimes due to intrinsic properties of perovskite [7].
Il Seok, “Perovskite precursor solution chemistry: From fundamentals to photovoltaic applications,” Chem.
Online since: July 2012
Authors: Zhen Bin Chen, De Fu Wang, Rui Sun, Yu Xiang Ma
The results showed that the diesel engine fueled with emulsified fuel leads to significant decrease in the emissions of soot and NOX and proper increase in fuel-efficiency without modifications in engine structures comparing with the diesel fuel.
Conclusions (1) Under the condition that the structure and regulation parameters of diesel engine have no changes, soot and NOX emissions of diesel engine fueled with emulsified fuel decrease significantly.
Journal of fuel chemistry and technology, 2003, 31(6):631-634.
Online since: November 2019
Authors: B. Vinod, L.J. Sudev
Plant based fibers such as banana, hemp, kenaf, PALF, jute, and coir has been used as reinforcement in a polymer matrix for the applications in consumer goods, furniture’s, civil and automotive structures and low-cost housing structures.
The technologies based on cryogenics have useful applications in a wide range of areas such as medicine, chemistry, power industry, space simulations and food processing by refrigeration.